NetApp
Cluster : High Availability : Understanding HA pairs : When takeovers occur
When takeovers occur
Takeovers can be initiated manually or occur automatically when a failover event happens, depending on how you configure the HA pair. In some cases, takeovers occur automatically, regardless of configuration.
Takeovers can occur under the following conditions:
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A takeover is manually initiated.
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A node is in an HA pair with the default configuration for immediate takeover on panic, and that node undergoes a software or system failure that leads to a panic.
By default, the node automatically performs a giveback, returning the partner to normal operation after the partner has recovered from the panic and booted up.
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A node that is in an HA pair undergoes a system failure (for example, a loss of power) and cannot reboot.
Note: If the storage for a node also loses power at the same time, a standard takeover is not possible.
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A node does not receive heartbeat messages from its partner.
This could happen if the partner experienced a hardware or software failure that did not result in a panic but still prevented it from functioning correctly.
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Hardware-assisted takeover is enabled and triggers a takeover when the remote management device (RLM or Service Processor) detects failure of the partner node.

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